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A kind of oil recovery method utilizing alkaline electrolysis water flooding

A technology of electrolysis of water and alkalinity, which is applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve problems affecting the production efficiency of ASP flooding, increased operating costs, and difficulty in handling the produced fluid, and achieve emulsification Good effect, low cost and easy construction

Active Publication Date: 2019-06-04
高立红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer flooding also has problems such as difficult treatment and pollution of the subsequent produced fluid
After the ASP flooding enters the scaling peak period, due to scaling, the mechanical wells will frequently jam the pump and increase the operating cost; the alkali in the injection fluid reacts with the ore in the formation and the fluid in the formation, resulting in a large amount of inorganic scale , Accumulated in the formation, the acid gas generated during the neutralization reaction will corrode the pipeline material; when adding surfactants, the surfactants generated by acid and alkali are not considered, which will cause duplication of process procedures and increase costs; these are serious Affect the mining benefit of ASP flooding

Method used

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  • A kind of oil recovery method utilizing alkaline electrolysis water flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Oilfield A was developed by water flooding, because the water content of the production wells produced by water flooding for many years is 99%, the salinity of the formation water is 5160 mg / L, and the viscosity of the crude oil is 110 mPa.s.

[0025] 1) Compatibility experiment: The pH of the alkaline electrolyzed water is 13.3, and the alkaline electrolyzed water is mixed with water injection to obtain the oil displacement liquid. Compared with the NaOH solution of the same pH value, the compatibility experiment with the formation water is as follows:

[0026] Table 1 Compatibility of flooding fluids with different concentrations and formation water

[0027] serial number

Alkaline electrolyzed water concentration

pH

Compatibility phenomenon

NaOH solution

Compatibility phenomenon

1

20％

10

No precipitation

20％

Precipitation is produced

2

40％

12.5

No precipitation

40％

Precipitation is produced

...

Embodiment 2

[0035] Oilfield B was developed by water injection. The water content of the production well was 65%, the salinity of the formation water was 10160 mg / L, and the viscosity of the crude oil was 20 mPa.s.

[0036] 1) Compatibility experiment: The pH of alkaline electrolyzed water is 13.9, and the alkaline electrolyzed water is mixed with water injection to obtain oil displacement. The compatibility experiment with formation water is as follows:

[0037] Table 3 Compatibility phenomenon of alkaline electrolyzed water with different concentrations and formation water

[0038] serial number

Alkaline electrolyzed water concentration

pH

Compatibility phenomenon

1

20％

12.8

No precipitation

2

40％

13

No precipitation

3

60％

13.2

No precipitation

4

80％

13.6

No precipitation

[0039] It can be seen that the range of the added concentration of alkaline electrolyzed water meets the water flooding condit...

Embodiment 3

[0046] Oilfield C, without water injection, the water content of the production well fluid is 98%, the salinity of the formation water is 10000mg / L, and the viscosity of the crude oil is 40mPa.s.

[0047] 1) Compatibility experiment: The pH of alkaline electrolyzed water is 11.8, and the alkaline electrolyzed water is mixed with water injection to obtain huff and puff. The compatibility experiment with formation water is as follows:

[0048] Table 5 Compatibility experiment of alkaline electrolyzed water with different concentrations and formation water

[0049]

[0050] It can be seen that the range of the added concentration of alkaline electrolyzed water meets the water flooding conditions of no precipitation and pH ≥ 8, and the specific concentration is screened by the effect of the core physical simulation oil displacement experiment.

[0051] 2) Huff and puff concentration experiment: The single-well huff and puff model experiment was carried out using alkaline electr...

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Abstract

The invention discloses a method for oil extraction by utilizing alkaline electrolysis water drive. The alkaline electrolysis water drive is adopted: alkaline electrolysis water and injection water are mixed and directly injected into a water injection well to perform water drive, or alkaline electrolysis water single well huff and puff is adopted: alkaline electrolysis water with a concentration of 1-100% is injected into a production well, the well is shut and closed after injection, and then the well is opened to perform production. The method has the advantages that the method is high in activity and displacement efficiency, green, environmentally friendly, free of secondary pollution; raw materials are easy to obtain, the cost is low, and the process is simple and easy to construct.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, in particular to an oil recovery method utilizing alkaline electrolysis water to drive oil. Background technique [0002] After primary and secondary oil recovery, about two-thirds of the crude oil remains in the oil layer. Due to the capillary force, this part of the oil is trapped in the finer capillary channels. It is difficult to replace it by simply increasing the pressure difference. Among the tertiary oil recovery technologies, chemical flooding is one of the most important oil recovery technologies, including polymer flooding, surfactant flooding, alkaline water flooding and three supporting ASP flooding. However, all types of chemical flooding have certain technical limitations. Surfactant flooding has the disadvantages of low activator sweep coefficient, poor oil displacement efficiency, serious adsorption loss, large amount of activator, high cost, and environmental poll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/20C02F1/461
CPCC02F1/4618C02F2001/4619E21B43/20
Inventor 高立红
Owner 高立红
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